TW200404277A - Optical disc apparatus and method for recording data onto an optical disc in multiple write sessions - Google Patents

Abstract

A method for using an optical disc apparatus to record data onto an optical disc in multiple write sessions. The optical disc apparatus includes a delay detection circuit for detecting gaps between data written to the optical disc in successive write sessions. The method includes writing a set of first data to the optical disc, searching for an ending location of the first data, writing a set of test data to the optical disc such that a beginning location of the test data is near the ending location of the first data, using the delay detection circuit to detect a gap between the first data and the test data, and writing a set of second data to the optical disc such that a beginning location of the second data is equal to the beginning location of the test data minus a value contained in the gap.

Description

200404277 V. Description of the invention (1) Technical field to which the invention belongs The present invention relates to an optical disc device and a method for accurately recording data on an optical disc using the optical disc device. In the prior art, in the process of writing data to an optical disc, a writing action may be interrupted due to various factors. One of the common reasons is that the writing action is too fast, which causes the buffer (buf f er) to store the data to be written. Within this time, there is no need to write data temporarily. This phenomenon is called buffer under ru ^. Under the circumstance that the interruption of the write operation cannot be completely avoided, Yamamtot discloses a process for processing the write operation in U.S. Patent No. 6,198,70 75 " Optical disc apparatus capable of multiple write sessions in a single track11. A conventional optical device for the interruption problem is included in the references of the present invention. The conventional optical device can perform multiple writing operations on a single track on an optical disc, thereby reducing problems caused by interruption of the writing operation. Please consider Figure 1. Figure 1 is a schematic diagram of a conventional optical disc device. A 1 pickup 1 4 reads and writes data from an optical disc 12. The data read during the data retrieval is transferred from the read / write head 1 4 to the reading responsible for the reading operation of the $ disc device 10. Fetch path circuit 16, then read path circuit 16 sends data to an interface and buffer 18, interface and buffer

200404277 V. Description of the invention (2) 1 8 is connected to a host computer and can temporarily store data. When writing data, the data to be written is transferred from the interface and the buffer 18 to a writing path circuit 19 responsible for the writing operation of the optical disc device, and then the writing path circuit 19 transfers the data to the read / write head 1 4 In order to write data on the disc 12. Assume that the disc device 10 is interrupted during the writing operation, for example, a write interruption occurs during the writing of the first data, because the written first data does not include all the data to be written to the disc 12 Therefore, if the portion of the first data that has not yet been written cannot be written to the optical disc 12 later, the optical disc 12 will be damaged. In order to solve this problem, the method adopted in the prior art is to write the second data to the optical disc 12 in different writing actions, and the second data is written to the same way as the first data previously interrupted. Please refer to FIG. 2. FIG. 2 is a flowchart for explaining how to write data on the same track with different writing actions. The steps of the flowchart are described as follows: Step 1 0 0: Start; Step 1 0 2: write the first data on the disc 12; step 104: search the end position of the first data; step 106: write the second data with the same interrupted first data by a different write operation On the track, and the start position of the second data is located a fixed distance from the end position of the first data; Step 108: Termination.

200404277

In short, the starting position of the second data should be a fixed distance from the position of the first data point, but due to the chain delay of the read path circuit interface and the buffer 18 and the write path circuit 19, It is quite difficult for the optical disc device 10 to make the start position of the second data immediately after the end position of the shell material. — Can calculate the sub-channel (such as Q ~ code in each section) by using a differentiator, or further use the EFM clock to calculate the section of the disc 2 To help determine the start and end positions of i 1 data. Therefore, when the second data is entered a fixed distance after the end position of the “I” data, it can also be said that the first time is a certain period of time after the end position of the first data (because it is calculated by —04 Bay signal).丨 2. When you write from the clock 12 to the third, you can use the optical disc device 10 to write one of the gap between the first and second data on the first light beam of the human light stele. The second nine is about to be written on the second disc; ΐ; Γ 4 = 0 to time = 13. The second half of Figure 3: Cannot consider the first-Beco's write action, the bottom + part is interrupted. F starts from time -0 and is expected to be the first at time After the data is written, the final position is written, and the first method is used to search for the first position.

200404277 V. Description of Invention (4)

Second information. In this method, the first data on the optical disc 12 is read by the read / write head 14 and then the first data is transmitted to the interface and the buffer 18 through the read path circuit 16. Once the end position of the first data is detected, the second data (the part that does not contain the first data to be written) is transferred to the read / write head 1 4 via the write path circuit 19 and written to the optical disc 1 2 on. However, it is quite difficult to make the start position of the second data exactly after the end position of the first data. Therefore, the start position of the second data is located at a fixed time FT after the end point of the first data. The starting position of the data is not at the position of time = 6, but at the position of time = 8. It must be noted that in the optical device 10, the fixed time FT may be a positive value or a negative value. Figure 3 shows an example where the fixed time F T is a positive value. However, if the positive value is too large, the distance between the first data and the second data will be too large, resulting in the loss of the second data read by the optical disc device 10 later. On the other hand, if the fixed time FT is a negative value, the first stage of the second data will cover the latter stage of the first data, causing some data to be written to be lost. In addition, since the optical disc device 10 uses the same fixed time FT to separate multiple different writing operations on the same lane, an incorrect fixed time FT value may cause problems when the optical disc device 10 is used.

SUMMARY OF THE INVENTION The object of the present invention is to provide an optical disc device for multiple writing.

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V. Description of the invention (5) Method for recording data on an optical disc, and in order to solve the problems in the prior art, the present invention has no gap between successive writing operations. According to a preferred embodiment of the present invention, The optical disc device includes a delay detection circuit for detecting a gap between data written in successive writing operations. The method first writes a set of first data on a disc, searches for the end position of the first data on the disc, and then writes a set of test data on the disc so that the start position of the test data is about the The end position of the first data, and then using the delayed debt test circuit to detect the gap between the first data and the test data, where the gap value is obtained by subtracting the end position of the first data from the start position of the test data ' Finally, a set of second data is written on the optical disc so that the starting position of the second data is located at the starting position of the test data minus the gap value. Since the optical disc device of the present invention uses a delay detection circuit to detect the gap between the first data and the test data, the starting position of the second data can be adjusted by the detected gap value. The second data may be immediately after the end of the first data, while maintaining the simultaneity of the first data and the second data, and preventing the second data from covering the latter part of the first data. Implementation

Page 10 200404277 V. Description of the Invention (6) Please refer to Figure IV. Fig. 4 is a schematic view of an optical disc device 20 of the present invention. The optical disc device 20 is approximately the same as the optical disc device 10 in the prior art. The same components and the same codes are used. The main difference is that the optical disc device 20 has a delay detection circuit 25 to identify and eliminate the optical disc 12. Data gap between successive write operations on the track. In order to further understand the operation of the optical disc device 20, please refer to FIG. FIG. 5 is a flowchart of a method for multiple writing operations on the same track of an optical disc according to the present invention. The steps in the process are described as follows: Step 1 3 0 ·· Start; Step 1 3 2: Write the first data on the optical disc 12; Step 1 3 4: Use the read path circuit 16 to search for the end point of the first data Step 1 3 6: Use the write path circuit 19 to write test data near the end position of the first data. Step 1 3 8: Use the read path circuit 16 connected to the delay detection circuit 25. Measure the gap between the first data and the test data; Step 1 40: Use the write path circuit 19 connected to the delay detection circuit 25, and write at the position at the beginning of the test data minus the gap value Second information, step 1 4 2: termination.

200404277 V. Description of the Invention (7) In order to further discuss the delay detection circuit 25, please refer to Fig. 6 and Fig. 7. FIG. 6 is a functional block diagram of the delay detection circuit 25 in the optical disc device 20 of the present invention. Figure 7 is the timing diagram of the eighteen to fourteen modulation clock signals. The delay detection circuit 25 includes a clock generation circuit 40 for generating _ groups of eight to fourteen modulation clocks, as shown in FIG. 7. The clock generation circuit 4 sends out a clock signal 3 tiger EFMCL0CK ′ and generates two delays of two different phases. The clock signals EMFCLK —D, EMFCLK —D2 and EMFCLK —D3 have a period of T. When these four clock signals are used simultaneously, their period becomes τ / 4, as shown in Figure 7. When the clock generating circuit 40 uses these four clock signals at the same time, its accuracy is four times that when only one clock signal is used. In this example, four EMF clock signals are used. Similarly, in order to increase the accuracy required for the ^ σ delay & test circuit 25, eighth, sixteen, or other clock signals can also be used. ^ The delay detection circuit 25 also includes a memory 44 for writing data, and a comparison circuit 4 2 for this # 姑 μ # memory desire and read data (read by the read path circuit parent) write (Incoming data), to ... out-delay gap value. Ratio ^: two = test capital is more effective than a group generated by the clock generation circuit 40. This is to take all active edges of the number and compare. Read the data by comparing. The obliqueness is 174. The data to be written in the clock 44 can determine the gap value. A stored in memory. In order to further understand the optical disc of the present invention, FIG. 20 is shown in FIG. 8. FIG. Both operations, please refer to the one-person write action to record the data 200404277 V. Description of the invention (8) Timing chart of the method on a disc EFMCLK-D, EFMCLK-D2 and pulse signals, which are used to compare edge timing The data is also written in Figure 8. The data to be written should be written on the disc. The first data is written to a part of the disc 12. However, the write contains all the data to be written. Data and detected this. The top half of Figure 8 is EFM The CLK, EFMCLK_D3izg eight to fourteen modulation circuits 42 actively include the data stored in the memory 44 at each clock, which refers to the original process before the write operation is interrupted. At the beginning, the optical disc device 2 0 Yes, the first data is interrupted because the operation to write data is interrupted, and the first data is not the end position of the read path circuit 16 that will read the first data of the disc. The next section of the μ warehouse was originally immediately after the first A piece of data that has not been written as the first data is written will be written on the disc 2 testly. From "" "the test data is not stored on the disc $ store purchase path circuit 16 will read Take a negative material and test data on the disc 12, and then the comparison circuit 42 on the delay detection circuit 25 compares the read data with the data to be written in the memory 44. The first data and the test data are accurately determined for f The value of the gap between reading and reading = The pulse width of the data to be written should be compared with the relative width of 3 ΐτΠιΛι. The pulse width of the data to be written will be between 'f lT. For example, in Figure 8, The data pulse is 16 T / 4 However, the read data pulse of 18T / 4, the pulse width data to be written prong length 2T / 4. The different delay values of the two gaps is the pulse width. In other words, the test data starting position

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Page 13 200404277 V. Description of the invention (9) 2T / 4 after the end position of the first data. The comparison circuit 42 then outputs this delayed data to the write path. The second data is written into the test data. The second data is such that the first data and the data on the 12th are the same as those stored in the memory. The situation after the material end position is due to the corresponding pulse width of the data to be written, that is, the beginning of the test data. In this case, the corresponding negative value of the data pulse to be written is broken, which means that After the second data position. Compared with the method of multiple discs 12 in the prior art, the first data method is to first write a test circuit 25 on the optical disc 12 to determine the first data and write the second data to read the first data. In the case where the gap is subtracted from the starting position of the data ^ a positive value, the first property can be maintained, and in the case that the second data can be saved, the method of the present invention is 19, so that the write path circuit 19 can be 2Τ / 4's position. Finally, if there is no gap between the two writing data, the desire to write the congratulations on the disc is the same. The starting position of the test data is in the first position. The pulse width of the read data is relatively long. The invention can also correct that the opposite position is located at the end position of the first data, and the pulse width of the read data is relatively short, so that the delay gap is at the beginning position and will be at the beginning of the test data. After the action is interrupted, the test data of the present invention then uses the delay > [the gap between the test data, and finally the starting position of the data is at the position of the test. Therefore, when the gap value is the same between one data and the second data. In addition, if the gap value is a negative value, it can avoid that

200404277 V. Description of the Invention (ίο) Covered in the previous paragraph of the second document. The above are only the preferred embodiments of the present invention, and any equivalent changes and modifications made in accordance with the scope of the patent application for the present invention shall fall within the scope of the exclusive examples of the present invention.

1X 1X 200404277 Brief description of the diagram Brief description of the diagram Figure 1 is a schematic diagram of a conventional optical disc device. Figure 2 is a flow chart of the conventional writing operation performed on the same track of an optical disc. Figure 3 is a timing diagram of the delay gap between the first data and the second data on a conventional disc. FIG. 4 is a schematic diagram of an optical disc device according to the present invention. Fig. 5 is a flow chart of a method for multiple writing operations on the same track of an optical disc according to the present invention. Fig. 6 is a functional block diagram of a delayed debt test circuit of an optical disc device according to the present invention. Figure 7 is the timing diagram of the eighteen to fourteen modulation clock signals. FIG. 8 is a timing diagram of a method for recording data on an optical disc in a multiple write operation of the present invention. Schematic symbol description

Optical disc device 12 Optical disc read / write head 16 Read path circuit interface and buffer 19 Write path circuit Optical disc device 25 Delay detection circuit Clock generation circuit 42 Compare circuit memory 100 First steps Page 16 200404277 Schematic description 102 Write Enter the first data Step 1 0 4 Search the first data end position Step 1 0 6 Write the second data a fixed distance after the first data end position Step 108 End step 130 Start step 132 Write the first data Step 1 34 Search First data end position step

1 3 6 Write the test data near the end of the first data. Step 1 3 8 Detect the gap between the first data and the test data. Step 1 4 0 Write the second data at the position where the gap between the first data and the test data is subtracted. Data Step 142 Termination Step

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Claims (1)

200404277 6. Scope of Patent Application 1. A method for recording data on an optical disc using an optical disc device, the optical disc device includes a delay detection circuit for detecting a gap between data written by different writing operations (Gap), the method includes: writing a set of first data on the optical disc; searching for an end position of one of the first data on the optical disc; writing a set of test data on the optical disc to make the test The data includes a starting position located approximately at the end position of the first data; using the delay detection circuit to detect a gap between the first data and the test data, the gap is subtracted from the starting position of the test data Obtained by removing the end position of the first data; and writing a set of second data on the optical disc so that the second data includes a starting position approximately equivalent to the starting position of the test data minus the gap value Its location. 2. The method according to item 1 of the patent application scope, wherein the delay detection circuit of the optical disc device further includes a memory for storing a data to be written, and the data to be written is a data to be written on the optical disc. The above data, and the method further includes comparing the data to be written with the first data and the test data to calculate a gap between the first data and the test data. 3. If the method of applying for the second item of the patent scope, wherein the first data and the test data can be combined into a group of reading data, and the method further includes Page 18 200404277 6. Scope of patent application Contains comparison between the data to be written and the read data to calculate the gap between the first data and the test data. 4. The method of claim 3 in the patent application range, wherein the delayed debt test circuit of the optical disc device further includes a clock generating circuit for generating a set of clock pulses, and the method further includes utilizing the delay detection The circuit reads the data to be written and the read data at the positive edge of the set of clock pulses (positive e (} ges)) to calculate the gap between the data to be written and the read data. 1. A method of complex iIΐ if range item 4, wherein the set of clock pulse packets /, eight to fourteen modulation clock signals with a specific frequency (EFM in phase, and the 箸), where each of the eight to ten The four modulation clock signals are not in sync with the clock signals. 〇1 The variable clock signals can be combined to generate a knot modulation clock signal '忑; the frequency of the second and second signals is the group of eight to fourteen. Recorded in a set contains: an optical disc device on a disc, the disc is equipped with a write circuit for " a read circuit for reading and writing a set of first data; the final position, and the To guide the = with the first information on the disc-trial funding So that the test of public resources ^ g, the way people write on a CD-ROM of the data end position; and 3 - about the equivalent of the first starting position Page 19, 200404277 6. Patent application scope-A delay detection circuit is used to detect the gap between the first data and the test data. The gap is the starting position of the test data minus the first data. The end position is calculated and used to instruct the writing circuit to write a second piece of data on the optical disc, so that the second piece of data includes a starting position equal to the starting position of the test data minus the gap value . 7. For the optical disc device according to item 6 of the patent application, wherein the delay detection circuit of the optical disc device further includes a memory for storing a data to be written, the data to be written is a data to be written to the optical disc. The data to be written is compared with the first data and the test data to calculate the gap between the first data and the test data. 8. For the optical disc device of the seventh scope of the application for a patent, the first set of data and the set of test data can be combined to form a set of read data, and the data to be written is used for the read data. Compare to calculate the gap between the first data and the test data. 9. For the optical disc device according to item 8 of the patent application, wherein the delay detection circuit of the optical disc device further includes a clock generation circuit for generating a set of clock pulses, and the delay detection circuit is used for When the active edges of the set of clock pulses read the value of the data to be written and the value of the read data to compare and calculate the data to be written and the value 200404277 VI. Scope of Patent Application The gap between reading data. 10. The device according to item 9 of the scope of patent application, wherein the set of clock pulses includes a plurality of eight to fourteen modulated clock signals having a specific frequency, wherein each of the eight to fourteen modulated clock signals is different Phase, and the eight to fourteen modulated clock signals can be combined to generate a combined clock signal whose frequency is a multiple of the frequency of the group of eight to fourteen modulated clock signals. Page 21